The Museum of HP Calculators


Calculator Comparison

Features in optional ROMs are listed as Option.
Features in HP mag card or tape Application Pacs are listed as +.
Other software is not included.
Display and Keyboard HP-11C HP-32S
Display type LCD LCD
Display format 1 Line 1 Line
FIXed number format Yes Yes
SCIentific number format Yes Yes
ENGineering number format Yes Yes
STanDard / ALL number format - Yes
Alpha messages and prompts - Yes
Softkeys labeled by mag. card or overlay - -
Softkeys labeled by display menus - Yes
Softkeys with neither labeling system Yes -
Status annunciators Yes Yes
Redefinable keyboard - -
Logic HP-11C HP-32S
Logic system RPN RPN
Stack levels 4 4
Last x Yes Yes
Undo - -
Precedence - -
Parentheses - -
Storage Addition (STO +) Yes Yes
Storage Arithmetic (STO +, −, ×, ÷) Yes Yes
Storage Exponentiation (STO ^) - -
Recall Arithmetic - Yes
Named variables - Yes
Multiple data types - -
Directories - -
Math HP-11C HP-32S
+, −, ×, ÷ Yes  Yes 
1/x Yes Yes
Yes Yes
x2 Yes Yes
LOG x Yes Yes
10x Yes Yes
LN x Yes Yes
ex Yes Yes
yx Yes Yes
π Yes Yes
% Yes Yes
% change Yes Yes
INTeger truncation and ABSolute value Yes Yes
Trigonometric functions (SIN, COS etc.) Yes Yes
Hyperbolic trig. (SINH, COSH etc.) Yes Yes
# of trig. modes (degrees, radians, grads) 3 3
Advanced Math HP-11C HP-32S
Solver / root finder - Yes
Numeric integration - Yes
Complex numbers - Yes
Matrix operations - -
Matrix writer - -
Equation writer - -
Symbolic operations - -
Fractions - -
Plotting and graphics (display) - -
Plotting and graphics (printer / plotter) - -
Statistical HP-11C HP-32S
Mean, standard deviation (# of variables) 2 2
Σ of n, x, x2 Yes Yes
Σ of n, x, x2, y Yes Yes
Σ of n, x, x2, y, xy Yes Yes
Σ of n, x, x2, y, y2, xy Yes Yes
Σ of lists - -
Random number generator Yes Yes
Linear regression, estimate  Yes Yes
Curve fitting - -
Correlation coefficient Yes Yes
Normal distribution - -
Factorial Yes Yes
Gamma Yes Yes
Combinations and permutations Yes Yes
Scientific and Time HP-11C HP-32S
Polar / rectangular conversions Yes Yes
Base conversions (2, 8, 10, 16) - Yes
Arithmetic in bases 2, 8 and 16 - Yes
Bit operations (AND, OR, XOR, ...) - -
Selectable word size (1-64 bits) - -
Selectable complement mode (1's, 2's, unsigned) - -
Decimal hrs / hrs.min.sec. conversions Yes Yes
Hrs.min.sec arithmetic - -
Time of day clock - -
Timer - -
Dynamic calculations (timer × rate) - -
Alarms - -
Unit Conversions HP-11C HP-32S
Centimeters / inches - -
Millimeters / inches - -
Meters / feet - -
Kilograms / pounds (mass) - -
Newtons / pounds (force) - -
British thermal units / joules - -
Liters / gallons - -
° Celsius / ° Fahrenheit - -
Other - -
User-defined units - -
Time Value of Money HP-11C HP-32S
Number of payments (n) - -
Interest rate (i) - -
Present Value (PV) - -
Payment (PMT) - -
Future Value (FV) - -
Cash Flow Analysis HP-11C HP-32S
Net present value (NPV) - -
Internal rate of return (IRR) - -
Amortization HP-11C HP-32S
Accumulated Interest (ACC INT) - -
Balance (BAL) - -
Depreciation HP-11C HP-32S
Straight line (SL) - -
Sum of the years digits (SOYD) - -
Declining balance (DB) - -
Bonds and calendar functions HP-11C HP-32S
Bond price - -
Bond yield - -
Date arithmetic / calendar functions - -
Memory and Programming HP-11C HP-32S
Programming language(s) RPN RPN
RAM / Max # of variables or addressable registers 21 26
Max # of program steps 203 260
RAM / Max vars or regs with full optional RAM - -
Max # of prog steps with full optional RAM - -
Merged program steps  Yes Yes
Manual register / program memory allocation  - -
Automatic register / program memory allocation Yes Yes
Overlapped register and program memory - -
Continuous memory Yes Yes
Flags 2 7
Conditional tests 8 8
Subroutine levels 4 7
Indexed looping (increment by +/- 1, end at 0) Yes Yes
Indexed looping (choice of increment and end) Yes Yes
Multiple index / loop registers - Yes
Line number addressing - -
Branching by relative line number - -
Global program label addressing Yes Yes
Local program label addressing - -
Indirect / computed addressing and control Yes Yes
Multiple indirection registers - -
Pause Yes Yes
Alpha messages and prompts in programs - Limited*
Alpha program listings - -
Alpha string manipulation - -
Program step insert / delete Yes Yes
I/O and Expansion Features HP-11C HP-32S
ROM modules - -
RAM modules or expansion option - -
General expansion slots / connector - -
Magnetic card reader/writer - -
Tape drive - -
Disk drive - -
Upgradeable firmware - -
Optical wand - -
Serial port - -
Infrared input - -
Infrared output - -
Printer - -
Networking - -
Other - -
General HP-11C HP-32S
Sounds - -
Self test Yes Yes
Hard case (in addition to soft case) - -
Additional Features - -
Batteries 3 SR44 3 SR 44
Length (inches) 5.1" 5.85"
Width 3.1" 3.15"
Height 0.6" 0.6"
Weight (oz or lbs) 4 oz 5 oz
Year of introduction 1981 1988
Features in optional ROMs are listed as Option.
Features in HP mag card or tape Application Pacs are listed as +.
Other software is not included.

Unlim means limited only by available memory.
HP-11C notes:
  • Self test: with the calculator off, hold the × key down and press and release ON, then release ×. The calculator will display running for around half a minute and then activate the entire display to indicate success. The test may be done continuously by (with the calculator off) holding + down while pressing the ON key. To stop the continuous test at the end of the current iteration, press and hold − and then press ON.
  • There is also a keyboard test. With the calculator off, press and hold ÷ and press ON. Now press each key from the top left moving left to right and then down (the enter key gets pressed in both the third and fourth rows.) If all keys are pressed in the correct order and are working, the model number (without the C) is displayed. Otherwise, Error 9 is displayed. (The display will show a changing pattern of segments as keys are pressed.)
HP-32S notes:
  • The Input statement could be used to stop the program and indicate which variable was to be entered. For example INPUT X would display X? followed by the current value of X. A new value could then be entered.
  • To start the self test, with the calculator on, press and hold the yx key and press the ON/C key. Pressing any key will step through a series of tests (including printing a copyright) until you see KBD 01. Then you must press each key from the upper left from left to right and then down until you see 32S OK If there is a problem, you will see a FAIL message. To exit the test, at any point, press and hold the LN key and then press the ON/C key. A continuous test (minus the keyboard test) can be started by holding 1/x and pressing ON/C. Exit this test in the same way as the individual test.

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